From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E6F593502AB for ; Fri, 13 Feb 2026 15:48:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770997724; cv=none; b=dQx4TuJV2fPZEu16RC3AaSZOrJ3n5Yy9UR+r/n63/Tg0ZsgUoaDPf/fwG+DEp+yXcIkfOtjIHfklnZSk4nsI03Z18XbropkduInv6WerYA9PXjQvZgx1aPzOXbYJuuQlYnrRCMx97sS0zSCwEVdwHcYZ59DKbRFftOjLuZ4B8oE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770997724; c=relaxed/simple; bh=PTJFDGkeSN26ugvAI4aRe+dHGTbs5yOXGvLemsc0sMk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TwThBGNHKp9huHwX27jKs4JvcTIeYqj3orvjUz5MVhLcP89pXhm/0tN7cgBgjuJMCr/ouv4Y/M25YqnmevhQN/IIMXO+qL2098fdMOb0lLVV4/iVx3KEWEHfUpluC9MT7aIS7ENBHGvc3Z9liMO9ecVyjq3epvI89kd5Cp0k+OM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=A5i2uuQp; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="A5i2uuQp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 58029C16AAE; Fri, 13 Feb 2026 15:48:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770997723; bh=PTJFDGkeSN26ugvAI4aRe+dHGTbs5yOXGvLemsc0sMk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=A5i2uuQpF4s1RFOexFyOdlWT+dXE1qKCpXkjUA0xr/6UY1MoU+yVgL9QvHoHDM8IH rC431ghZqIHGKIL6pVXQ+0+4eQmd2glx1lLIlywGoD2re53AX+ch0/uyhKc2EIq8cf 6SNYfTseYYlyvuflEn8V/8GJSV21MAskpD0706/8XWrDujqh6ISUuxFNC4HB+vPxmL eIxtXbi10RQLYhZBOS7c7uR4tW+2NPD5wU36IkEkyVpVUNJ51GTeqUeMrwnJePnZId d2zLfhxtUd6qY4o9kcgFL3UQEbttabvpBsumzZxNnE0vESnBZEuZdKh0g+gs21p00f HPFAulJJy8OvA== Received: from phl-compute-08.internal (phl-compute-08.internal [10.202.2.48]) by mailfauth.phl.internal (Postfix) with ESMTP id 84B87F40069; Fri, 13 Feb 2026 10:48:42 -0500 (EST) Received: from phl-frontend-03 ([10.202.2.162]) by phl-compute-08.internal (MEProxy); Fri, 13 Feb 2026 10:48:42 -0500 X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeefgedrtddtgddvtdekieehucetufdoteggodetrf dotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfurfetoffkrfgpnffqhgenuceu rghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujf gurhephffvvefufffkofgjfhgggfestdekredtredttdenucfhrhhomhepfdfmihhrhihl ucfuhhhuthhsvghmrghuucdlofgvthgrmddfuceokhgrsheskhgvrhhnvghlrdhorhhgqe enucggtffrrghtthgvrhhnpefhudejfedvgeekffefvdekheekkeeuveeftdelheegteel gfefveevueekhfdtteenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhgrih hlfhhrohhmpehkihhrihhllhdomhgvshhmthhprghuthhhphgvrhhsohhnrghlihhthidq udeiudduiedvieehhedqvdekgeeggeejvdekqdhkrghspeepkhgvrhhnvghlrdhorhhgse hshhhuthgvmhhovhdrnhgrmhgvpdhnsggprhgtphhtthhopeduvddpmhhouggvpehsmhht phhouhhtpdhrtghpthhtoheprghruggssehkvghrnhgvlhdrohhrghdprhgtphhtthhope htghhlgieskhgvrhhnvghlrdhorhhgpdhrtghpthhtohepmhhinhhgohesrhgvughhrght rdgtohhmpdhrtghpthhtohepsghpsegrlhhivghnkedruggvpdhrtghpthhtohepuggrvh gvrdhhrghnshgvnheslhhinhhugidrihhnthgvlhdrtghomhdprhgtphhtthhopehthhho mhgrshdrlhgvnhgurggtkhihsegrmhgurdgtohhmpdhrtghpthhtohepgiekieeskhgvrh hnvghlrdhorhhgpdhrtghpthhtoheplhhinhhugidqvghfihesvhhgvghrrdhkvghrnhgv lhdrohhrghdprhgtphhtthhopehlihhnuhigqdhmmheskhhvrggtkhdrohhrgh X-ME-Proxy: Feedback-ID: i10464835:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Fri, 13 Feb 2026 10:48:42 -0500 (EST) From: "Kiryl Shutsemau (Meta)" To: Ard Biesheuvel , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , Tom Lendacky Cc: x86@kernel.org, linux-efi@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Moritz Sanft , "Kiryl Shutsemau (Meta)" Subject: [PATCH 1/2] efi: Fix reservation of unaccepted memory table Date: Fri, 13 Feb 2026 15:48:37 +0000 Message-ID: <20260213154838.46567-2-kas@kernel.org> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20260213154838.46567-1-kas@kernel.org> References: <20260213154838.46567-1-kas@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The reserve_unaccepted() function incorrectly calculates the size of the memblock reservation for the unaccepted memory table. It aligns the size of the table, but fails to account for cases where the table's starting physical address (efi.unaccepted) is not page-aligned. If the table starts at an offset within a page and its end crosses into a subsequent page that the aligned size does not cover, the end of the table will not be reserved. This can lead to the table being overwritten or inaccessible, causing a kernel panic in accept_memory(). This issue was observed when starting Intel TDX VMs with specific memory sizes (e.g., > 64GB). Fix this by calculating the end address first (including the unaligned start) and then aligning it up, ensuring the entire range is covered by the reservation. Fixes: 8dbe33956d96 ("efi/unaccepted: Make sure unaccepted table is mapped") Reported-by: Moritz Sanft Signed-off-by: Kiryl Shutsemau (Meta) --- drivers/firmware/efi/efi.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 111e87a618e5..56e9d73412fa 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -692,13 +692,13 @@ static __init int match_config_table(const efi_guid_t *guid, static __init void reserve_unaccepted(struct efi_unaccepted_memory *unaccepted) { - phys_addr_t start, size; + phys_addr_t start, end; start = PAGE_ALIGN_DOWN(efi.unaccepted); - size = PAGE_ALIGN(sizeof(*unaccepted) + unaccepted->size); + end = PAGE_ALIGN(efi.unaccepted + sizeof(*unaccepted) + unaccepted->size); - memblock_add(start, size); - memblock_reserve(start, size); + memblock_add(start, end - start); + memblock_reserve(start, end - start); } int __init efi_config_parse_tables(const efi_config_table_t *config_tables, -- 2.51.2